[sdiy] Re: FPGA 2-OP FM MIDI Polysynth

[Scott Nordlund]

>From what I recall of the Synergy's schematic, the logic seemed to act as a sort of "coprocessor" with the CPU controlling the data paths and whatnot.  The EGS and OPS chips in the DX7 are acting more or less autonomously.  

Of course this makes sense- the Synergy implements a third as many oscillators but (as far as I know) is far more versatile in the way that they're combined.

----------------------------------------
> From: lanterma at ece.gatech.edu
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Re: FPGA 2-OP FM MIDI Polysynth
> Date: Mon, 4 May 2009 02:03:47 -0400
>
> On May 4, 2009, at 2:00 AM, Ullrich Peter wrote:
>
>> In the 80s it was not that simple for DSP arithmetics... The DX7
>> prototype has been built out of thousands of discrete logic circuits.
>> See photo on http://www.soundofmusic.se/synthsandmore/dx7.htm
>>
>> For the DX7 all these circuits have been implemented in a few ASICs...
>
> The Synergy's digital oscillator board has about 120 standard TTL
> logic chips on it. It's a sight to behold...
>
> ...of course, when the DX7 came in with its ASICs at a much cheaper
> price point the Synergy didn't stand a chance.
>
> - Aaron
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